Improvement in mill-spindle speings



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- @niet geen' im -THOM-AS ALSOP, OAF ELKE-ART, ILLINOIS.

LettersJPate-ztztllo. 79,537, dated July 7 1868.

IMPROVEMENT IN MILL-SPINDLE SPRINGS.

i To nu. WHoM Ir MAY ooNcnnN; p v

Be it *known that I, THOMAS A LSOP, of Elkhart city, Logan county, and State of Illinois, have inventedcertannew and useful mprovernentsjin Mill-Spindle Springs;- .and I do hereby declare that the following isl .a full, clear, and exact descriptiondf the sanic, reference being hndto the annexed drawings, and to theletters of reference marked thereon, making part of this specification, in which-' Figure 1 is a. Asectional view of my'inv'ention as applied to a mill`spindle, with the stone attached.-

Figure 2 is a plan view of the pinion, with'nthe spring attached, and showing the position of its free endV when the saine is detached froml the spindle.

'.lhevnaturefof my invention consists in uniting a pinion-wheel to the spindle by .means ofl a coil-spring, one endV of the same being heldv by a stump or projecting pinion the upper face of the pinion, and the other by a removable bolt passing through the'spindle. l 4

The object of my invention, is, by a simple and practical method,zto' aifordui.Y safe. and sure connection between the pinion and spindle, one.tha t can easily be detached, and one that, at the same time, entirely avoids all jarring in the starting'ef thepmachinery, no matter how sudden the sameImayVbe, thus' freeing it of all the injurious induences. arising from the backlash, which practical experience h-as -long since demonstrated v is so destructive in-all classes of mechanism, especially such as"millgeariug i In all other methods of connecting the spindle with the pinion, there. js a sudden start the instant the. powerl is applied, which causes necessarily a violent jur to the gearing. Butby my meth'od, when lthe machinery is started,-before the spring reaches its full tension, sufficient play is allowed to avoid this entirely, the efect produced by the application. of. the power being gradual, unt-il such a point iso-cached that allows the pinion to start'rewithout the slightest jar. p I

K Bythe action of the spring, the pressure is'continnous upon-the pinion, andthe force'on' the spindle is' equalized', and the spring being so connected with the spindle, by means ot- .a'bolt or other suitable device, that when the same is removed, whichcan readily at' any moment be'dene, the pinon, l with the spring, 'can riseup .on th-o spindle tosuch a degreeA of -height as-to insure of 'thesame being thrown entirely out of geen Or it is 'not' neeessary,eveu according to my plan,thatrtlie pinion should rise on-tlie spindle in order that the machinery he thrown ont of'gear, .for when the bolt is withdrawn, 'even should the,pinion continue to` revolve with its usual velocity,.i tfails to impart any momentum to the spindle. f

` The g'r'eatadvantege of this arrangement will readily suggest itself to any onegin'the slightest degree familiar with 'the various branches of thel art to which Amy invention is applicable;`e. g.',in`milling, it permits themiller to stop, and talle up a millstone, dress it, put it down again, and set running', without stopping the einer mehine'y of the min;

To enable others skilled infthe art to make and use my invention, I will proceed to' describe its construction and operation. e i

A is un ordinary framework, suitably-arranged to contain'the necessary mechanism. Ou the base of the 'iframe A is arranged a suitable'step, F, for the spindle to work in. I

' Q is the spindle, having its lower bearing in the step F,'and its upper in the cross-.beam A ofltheffrume A. This spindle projects sufilciently far through the cross-beam A to allow of .its being firmly secured to the stone, 13.

' 0n 'the spindle C there is afriction-liub, E. This hub E lfurnishes a bearing for the pinion D'. On the upper face of. thepinion D there i's a stump or projecting pin,c. Over one end of this pin c passes a loop, formed in one end oi" the coil-springy C. This coil-spring C is wound around the spindle O, and itsvupper end firmly secured to the spindle C by means ofa bolt, c. A A

It will readily bev seenthat by withdrawing this bolt c, the spring loses all power. over the spindle, Cl and thus the pinion D can be allowed to rise o n the spindle, lor if the pinion i s` still left in gear with the driving wheel, so as to revolve with its usual velocity, itfails to impart any momentum'- to'the spindle C.- Blf*- tlfe chief advantage of Iny invention consists in tile fact that the springieqnalize's thev draght, dnd avoidsall the shock caused by the sudden start, thus entirelynvoidng the'great evil incident to' the backlash,

Having thils fully described my invention, and the operfation of 'the same, what I claimthexjein as new, and -l desire to secure by Letters Patent of the UnitedStates, is-

The spindle G and pinion D, in combination with the spring C', when the saine is connected 'with the spindle t :ind pinion bymeamsof the projecting pin and li'erm'wnble bolt c, andthe whole is constructed and arranged t substantially' as and for the-purpose specified.l

In testimony whereof, I have signed my name to this specification in the presence of two sixbscribing witnesses.

' THOMAS ALSOI?.v

Witnesses:

J. GARDEL,

C. ORNDORFF. 

